Abstract
Ultrasonic phased array testing technology plays an increasingly important role in the field of nondestructive testing. The size of phased array probes is very important for ultrasonic phased array testing. In this paper, based on the theory of acoustic directivity, the one-dimensional linear phased array probe was used as a research model to design a linear phased array probe for aluminum alloy die castings. Firstly, the influence of probe parameters on directivity function was analyzed. Secondly, the directivity function and sound field were simulated by MATLAB. The simulation results showed that increasing the number of array elements N and the value of d⁄λ can minimize the main lobe width, eliminating the grating lobes by choosing the appropriate distance between the centers of two array elements d, and suppressing the side lobe amplitudes by increasing the number of array elements N and reducing the value of d⁄λ. Finally, the parameters of linear phased array probes were given according to the structure of aluminium alloy die castings, and the correctness of the probe parameters was verified.
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